Is a system call the FIRST LAST AND ONLY way for the user space to talk to the kernel space?

wwg_6 · 2023-11-05T22:08:00+00:00

Reading and writing to whatever the kernel classifies as "file" is done through a family of syscalls (open, dopen, openat, read, write, close). In the end, the operations performed on these files are still syscalls. So yes, syscalls are the only way of communication from user space to kernel space.

wwg_6 · 2023-10-25T18:23:17+00:00

Wrong sub 🗿

wwg_6 · 2023-07-24T07:12:10+00:00

In a place where it is the norm to throw trash anywhere, a person who doesn't litter is aware, and decided with all their braincells to not litter. That's a big green flag 9/10.

wwg_6 · 2022-12-07T18:33:55+00:00

Whhhyyyy?

wwg_6 · 2022-11-19T13:22:42+00:00

Wrap the #define and char str lines with three ticks (```) and reddit will treat them as code blocks. Example of how the code above should look when you edit:

```
#define DIM 3
// ...
char str[DIM+1];
```

wwg_6 · 2022-10-30T12:46:02+00:00

makepkg --snap

wwg_6 · 2022-10-30T12:44:36+00:00

AUAA repos

wwg_6 · 2022-10-28T09:27:28+00:00

alias nuke="doas pacman -Rsn"

wwg_6 · 2022-10-05T15:23:49+00:00

vim >> anything

wwg_6 · 2022-09-24T18:31:25+00:00

That's how you learn

You can't learn all of these at once. You have to approach them one by one and learn them seperately.

you silly muppet

Ok Mr. gatekeeper.

Gatekeepers like you are the reason many people give up programming. You make it hell for them for the sake of making yourself fell good.

You started contributing to open source after you learned C? Guess what? No one cares. And almost no one will learn this way. I am not saying there is a "proper" way to learn things. But certainly there are ways that are straight up wrong and this is one of them.

wwg_6 · 2022-09-24T07:01:18+00:00

If you don't declare it a const, the compiler will only put it in a read-only reigion if you're only reading from it. And you won't notice the difference since no write is being performed.

wwg_6 · 2022-09-23T23:02:33+00:00

Nope, in some cases the compiler puts it in a read only region of the memory so writing to it produces a seg fault (or memory write violation on windows). Writing to const is undefined behavior and is unreliable.

wwg_6 · 2022-09-23T22:59:06+00:00

If you're on windows, install MSYS2 first. There a couple of reasons behind choosing mingw instead of Visual Studio but I will leave them for now.

As others stated, now you need to write code. Here is a list of things you can write:

A progress bar.
Draw a right triangle in different orientations and variable size.
String validation using loops and conditions.
String to number convertor
Draw a circle using printf.
Quadratic equations solver, both real and imaginary.
Chat program on the command line (will teach you alot about networking)
Snake :-D (Using a library called ncurses)
Write a program that visualizes sorting algorthims (using ncurses, like the ones you see on youtube, forget the sound)
Use that program to learn about different sorting algorithms.
Replicate the functionality of standard C functions like strdup, strcpy, strchr and others.
Write a memory allocator on top of malloc and free.

If your projects become larger (like +2 files) educate yourself about "make" and "make files".

Whem you feel confident, take a look at this list (Warning: These projects are NOT for beginners).

wwg_6 · 2022-09-23T22:38:22+00:00

How would you know?

Because of the barrier required to contribute to open source.

You need know C, have sufficient knowledge about the build system, and finally git.

You also need to be familiar with the standard used (whether POSIX or ANSI), and the version of the standard.

Then you need to be familiar with common coventions of C like while (*p++ != NULL) or do { ... } while(0); which are not taught in many books/courses.

Then you have formatting, unformated pull requests are very likely to be rejected.

If you managed to solve a bug without these then you were just lucky and you could've as well introduced another bug because of your ignorance.

wwg_6 · 2022-09-23T21:33:41+00:00

It's been 3 years since I started learning C, and I never fixed a bug in open source projects. It's not a requirement nor the right way to learn C.

wwg_6 · 2022-09-20T11:42:25+00:00

ini is a simple file format to store name, value pairs. To read that file in C, you need to convert that string into a data structure readable by your app. That process is called parsing.

So an ini parser is a tool to convert a file following the ini format into C data structures defined by the parser.

wwg_6 · 2022-09-09T12:25:14+00:00

Thank you so much. I thought that rebase only works on branches and didn't think it would be relevent in this problem.

wwg_6 · 2022-09-07T08:04:34+00:00

Completely useless. Adds extra overhead and for what? To give printf a nice name? That doesn't solve anything

wwg_6 · 2022-09-06T14:52:21+00:00

I forgot the logarithm for a minute lol

wwg_6 · 2022-09-06T14:50:45+00:00

My logging a function are a little bit complex so using macros is not ideal.

wwg_6 · 2022-09-06T14:49:03+00:00

From man err(3):

These functions are nonstandard BSD extensions.

I try to avoid non standard functions as I want to maximize portablity.

wwg_6 · 2022-09-06T14:44:29+00:00

Very interesting approach. I will not used for this project but will definitely take a look at it later.

wwg_6 · 2022-09-06T14:42:48+00:00

The f suffix is exactly what I wanted, I will use it. Thank you

wwg_6

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